Why did he shout on me?

My gym trainer (general one, not personal trainer) I think likes me because he used to get really jealous whenever any guy used to come upto me, he asked me to stay away from people in the gym.. He sent me a diet plan on my number, I wanted another one since it had been two months since he had shared a new plan.. He asked me to remind him on whatsApp.. I texted him, he replied by saying, "finally busy person has got the time to text".. I replied by saying that I'm not busy, it just always slipped my mind to remind you.. He said that anyway he was kidding.. I felt he got offended because he didn't send me the diet plan and the next day, he was really irritated at me.. Unnecessarily shouted on me and he's always been really sweet to me.. Why did he do so, why did he shout?

Why did he shout on me?
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